1H, 13C, and l29Xe NMR Study of Changing Pore Size and Tortuosity During Deactivation and Decoking of A Naphtha Reforming Catalyst
Proton, 13C, and 129Xe NMR were applied for characterizing the change of the tortuosity, the chemical structure of the coke, as well as the pore size during the deactivation and decoking of a commercial naphtha reforming catalyst (Pt/Re-Al2O3). All experimental evidence indicates that a full recovery of the activity of the clean catalyst is not achieved by the regeneration process, and that the quality of regeneration depends on the coke content reached during the deactivation/regeneration cycle.
Unable to display preview. Download preview PDF.
- 1.Bell, A. T. and Pines, A. (1994) NMR techniques in catalysis, Marcel Dekker, New York.Google Scholar
- 4.Callaghan, P. T. (1991) Principles of Nuclear Magnetic Resonance Microscopy, Clarendon Press, Oxford.Google Scholar
- 5.Kimmich, R. (1997) NMR Tomography, Diffusometry, Relaxometry. Springer, Berlin.Google Scholar
- 6.Blümich, B. (2000) NMR imaging of materials, Oxford University Press, Oxford.Google Scholar
- 7.Cotts, R. M., Hoch, M. J. R., Sun, T., and Markert, J. T. (1989) Pulsed field stimulated echo methods for improved NMR diffusion measurements in heterogeneous systems, J. Magn. Reson. 83, 252–266.Google Scholar
- 8.Parere, J. M. (1991) in C. H. Bartholomew and J. B. Butt (eds.) Catalyst Deactivation. Elsevier Science Publ. B.V., Amsterdam, pp. 103–110.Google Scholar
- 9.Jess, A., Hein, O., and Kern, C. (1999) Deactivation and decoking of a naphtha reforming catalyst. Study in Surface Science and Catalysis, Elsevier Science, Amsterdam, pp. 81–88.Google Scholar